Quoting Prasad Malisetty (2022-02-24 01:43:34)
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index c19cd506..f4a5e3c 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1616,6 +1621,96 @@ static int qcom_pcie_probe(struct platform_device *pdev)
> return ret;
> }
>
> +static int qcom_pcie_send_pme_turnoff_msg(struct qcom_pcie *pcie)
> +{
> + int ret;
> + u32 val, poll_val;
> + u64 l23_rdy_poll_timeout = 100000; /* microseconds */
unsigned long instead of u64? But why is it a local variable at all?
Just inline it in the one place it is used?
> + struct dw_pcie *pci = pcie->pci;
> + struct device *dev = pci->dev;
> +
> + val = readl(pcie->elbi + PCIE20_ELBI_SYS_CTRL);
> + val |= PCIE_PME_TURNOFF_MSG;
> + writel(val, pcie->elbi + PCIE20_ELBI_SYS_CTRL);
> +
> + ret = readl_poll_timeout((pcie->parf + PCIE20_PARF_PM_STTS), poll_val,
> + (poll_val & PCIE_PM_LINKST_IN_L2),
> + 10000, l23_rdy_poll_timeout);
> + if (!ret)
> + dev_dbg(dev, "Device entered L23_Ready state\n");
> + else
> + dev_err(dev, "Device failed to enter L23_Ready. PM_STTS 0x%x\n",
> + readl_relaxed(pcie->parf + PCIE20_PARF_PM_STTS));
> +
> + return ret;
> +}
> +
> +static void qcom_pcie_host_disable(struct qcom_pcie *pcie)
> +{
> + qcom_ep_reset_assert(pcie);
> +
> + /* Put PHY into POWER DOWN state */
> + phy_power_off(pcie->phy);
> +
> + writel(PHY_POWER_DOWN, pcie->parf + PCIE20_PARF_PHY_CTRL);
> +
> + if (pcie->ops->post_deinit)
> + pcie->ops->post_deinit(pcie);
> +
> + /* Disable PCIe clocks and regulators */
> + pcie->ops->deinit(pcie);
> +}
> +
> +static int __maybe_unused qcom_pcie_pm_suspend_noirq(struct device *dev)
> +{
> + int ret;
> + struct qcom_pcie *pcie = dev_get_drvdata(dev);
> + struct dw_pcie *pci = pcie->pci;
> +
> + if (!dw_pcie_link_up(pci)) {
> + dev_dbg(dev, "Power has been turned off already\n");
> + return 0;
> + }
> +
> + ret = qcom_pcie_send_pme_turnoff_msg(pcie);
> + if (ret)
> + return ret;
> +
> + /* Power down the PHY, disable clock and regulators */
> + qcom_pcie_host_disable(pcie);
> +
> + return 0;
> +}
> +
> +/* Resume the PCIe link */
> +static int __maybe_unused qcom_pcie_pm_resume_noirq(struct device *dev)
> +{
> + int ret;
> + struct qcom_pcie *pcie = dev_get_drvdata(dev);
> + struct dw_pcie *pci = pcie->pci;
> + struct pcie_port *pp = &pci->pp;
> +
> + ret = qcom_pcie_host_init(pp);
> + if (ret) {
> + dev_err(dev, "cannot initialize host\n");
> + return ret;
> + }
> +
> + dw_pcie_setup_rc(pp);
> +
> + qcom_pcie_start_link(pci);
> +
> + ret = dw_pcie_wait_for_link(pci);
> + if (ret)
> + dev_err(dev, "Link never came up, Resume failed\n");
But we ignore and don't return ret? Please add a comment about why
that's done, or return ret below.
> +
> + return 0;
> +}
> +
> +static const struct dev_pm_ops qcom_pcie_pm_ops = {
> + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(qcom_pcie_pm_suspend_noirq, qcom_pcie_pm_resume_noirq)
Why is noirq used? Please add a comment. And better yet don't use noirq
hooks and use the normal suspend/resume hooks.
> +};
> +
> static const struct of_device_id qcom_pcie_match[] = {
> { .compatible = "qcom,pcie-apq8084", .data = &apq8084_cfg },
> { .compatible = "qcom,pcie-ipq8064", .data = &ipq8064_cfg },
